[Bug 1852645] [NEW] WebAudio API does not behave as expected (Cannot mute videos)

[Jack J]

Public bug reported:

I initially posted this bug to the Firefox issue tracker here:
https://bugzilla.mozilla.org/show_bug.cgi?id=1596397, but we determined
it was specific to the Ubuntu package.

When I play the video in this JSFiddle: https://jsfiddle.net/ea9h3bg7/,
there should be no audio. This is the behavior in the Firefox 70 build
that you can get from Mozilla's website. However, with the Ubuntu build,
audio is still heard.

---

Ubuntu 19.10, Firefox that shipped with the distro, upgraded to 70.0.1
via the Ubuntu update manager.

Firefox package version:

firefox:
  Installed: 70.0.1+build1-0ubuntu0.19.10.1
  Candidate: 70.0.1+build1-0ubuntu0.19.10.1
  Version table:
 *** 70.0.1+build1-0ubuntu0.19.10.1 500
        500 http://fr.archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu eoan-security/main amd64 Packages
        100 /var/lib/dpkg/status
     69.0.3+build1-0ubuntu1 500
        500 http://fr.archive.ubuntu.com/ubuntu eoan/main amd64 Packages

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  WebAudio API does not behave as expected (Cannot mute videos)

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